The US has no formal diplomatic ties with Taiwan but is bound by law to provide the democratically governed island with the means to defend itself.

While China's drills around Taiwan have abated, it is still carrying out military activities.

China is unlikely to display its best tactics and strategies during drills that it knows are being watched closely, said one of the officials, speaking on condition of anonymity.

The geopolitical storm that followed US speaker Nancy Pelosi's visit is likely to put the livelihoods of farmers and fishermen in the Taiwan's southern Pingtung county at further risk.

The tariffs were imposed in 2018 and 2019 by Trump on thousands of Chinese imports valued then at US$370 billion to pressure China over its suspected theft of US intellectual property.

Drills have included launches of ballistic missiles, some of which flew over the island's capital of Taipei, and simulated sea and air attacks in surrounding skies and waters.

China had said in two previous white papers on Taiwan, in 1993 and 2000, that it 'will not send troops or administrative personnel to be based in Taiwan' after achieving unification.

China has sent ships and aircraft across an unofficial buffer between Taiwan and China's coast and missiles over its capital, Taipei, and into waters surrounding the island.

Taiwan, which is claimed by China as its own, says it will not be intimidated even as the drills continued with China often breaching the unofficial median line down the Taiwan Strait.

China deployed scores of planes and fired live missiles near during military exercises sparked by US House of Representatives Speaker Nancy Pelosi's visit to Taiwan.

China's military has said the sea and air joint exercises, north, southwest and east of Taiwan, had a focus on land-strike and sea-assault capabilities.

China is also suspending exchanges with Washington on countering cross-border crime and drug trafficking.